Podbrain 
What Neil Degrasse Tyson Says About Space
4 episodes featuring Neil Degrasse Tyson on space
Key Insights on Space
Time machines must also be space machines - going back 30 years works because Earth returns to its orbital position, but shorter periods would leave you in empty space
- Wormholes could theoretically connect to other universes in a multiverse, but different physics might make such travel lethal
- The only defense against an approaching black hole would be moving Earth itself to another star system using massive rocket propulsion
- Slingshot maneuvers work not from gravity alone but by entering a planet's reference frame - "you're pulling into a moving planet" gaining orbital energy without using rocket fuel
- Gravity and acceleration are experimentally indistinguishable - Einstein's equivalence principle shows 1G on Earth equals 32 feet per second squared acceleration in space
Episodes
Books on space
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